suggest installing latest node LTS release, making sure references to…

[shieldo]

… release versions are consistent

What does this change?

Module: JS Core 1 Week(s): 1 (preparation)

Checklist

• [x] I have read the contributing guidelines
• [x] I have checked my spelling and grammar with an automated tool
• [x] I have previewed my changes to check the markdown renders as I intend
• [x] I have run my code to check it works
• [x] My changes follow our Style Guide

Description

The installation instructions for Node.js in the preparation for JS Core 1 reference inconsistent versions. Changed to specify Node 18 as the current LTS version - both Node 14 and Node 16 end-of-life in the next few months so it would be better for trainees to be running the latest LTS.

Who needs to know about this?

Rendered Pages

[shieldo]

I've re-applied my changes here to the updated document.